title: Switchable domain partitioning and diffusion of DNA origami rods on membranes.
abstract: Recently, DNA origami became a powerful tool for custom-shaped functional biomolecules. In this paper, we present the first approach towards assembling amphipathic three-dimensional DNA origami nanostructures and assessing their dynamics on the surface of freestanding phospholipid membranes. Our nanostructures were stiff DNA origami rods comprising six DNA helices. They were functionalized with hydrophobic cholesteryl-ethylene glycol anchors and fluorescently labeled at defined positions. Having these tools in hand, we could demonstrate not only the capability of the amphipathic nanorods to coat membranes of various phospholipid compositions, but also their switchable liquid-ordered/liquid-disordered partitioning on phase separated membranes. The observed translocation of our nanostructures between different domains was controlled by divalent ions. Moreover, selective fluorescent labeling enabled us to distinguish between the translational and rotational diffusion of our six helix bundles on the membranes by fluorescence correlation spectroscopy. The obtained data reveal how DNA origami can be employed as a valuable tool in membrane biophysics.
authors.affiliation: Biophysics, BIOTEC, Technische Universität Dresden, Tatzberg 47/49, D-01307 Dresden, Germany.
authors.forename: Aleksander
authors.initials: A
authors.lastname: Czogalla
authors.forename: Eugene P
authors.initials: EP
authors.lastname: Petrov
authors.forename: Dominik J
authors.initials: DJ
authors.lastname: Kauert
authors.forename: Veselina
authors.initials: V
authors.lastname: Uzunova
authors.forename: Yixin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Ralf
authors.initials: R
authors.lastname: Seidel
authors.forename: Petra
authors.initials: P
authors.lastname: Schwille
mesh_terms: D001703:Biophysics; D002462:Cell Membrane / Q000737:chemistry*; D002784:Cholesterol / Q000031:analogs & derivatives / Q000737:chemistry; D004247:DNA / Q000737:chemistry*; D004058:Diffusion; D005026:Ethylene Glycols / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D049329:Nanostructures / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D010713:Phosphatidylcholines / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry / Q000378:metabolism; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D005026:Ethylene Glycols; C543684:O-cholesteryl ethylene glycol; D010713:Phosphatidylcholines; D010743:Phospholipids; D004247:DNA; D002784:Cholesterol; C017251:1,2-oleoylphosphatidylcholine